<div class="form">
    <form method="post" action="<?php echo $this->action ?>" id="newsletter-form">
        <div class="controls">
            <input type="email" name="email" id="newsletter-email" placeholder="Sign up to our newsletter" required="" style="float:left" />
            <input type="submit" value="Submit" class="btn" />
        </div>
    </form>
</div><!-- form -->